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논문

전체
F층 풍력 발전기의 회로
  • 박재흥; 헤르만 뤼어; 요스케 야마자키;
  • 2020-10-23
  • JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125 11 : 1~15
since the 1970s, the return path has not been thoroughly investigated. In this study, we revisit the magnetic field data of the Challenging Mini-satellite Payload (CHAMP) to address the statistical distribution of the return currents. In addition to the F-region dynamo currents near the dip equator, we have identified off-equatorial bands with the reverse polarity. Both equatorial and off-equatorial bands flip signs around 1600 magnetic local time (MLT) and are weakest during June solstice. These similarities suggest that the off-equatorial currents are tied to the equatorial F-region dynamo and provide the return paths. The off-equatorial return currents have the following characteristics. First, they are mostly confined within ±20o in magnetic latitude (MLAT) at CHAMP altitudes, which corresponds to <1300 km apex height. Second, the peak locations of the equatorial dynamo and the off-equatorial return currents are zonally displaced from each other in terms of MLT and longitude. It implies that zonal currents in the topside F-region participate in the current closure. Third, the return currents exhibit multiple zonal bands (beyond |MLAT|>20o) near dusk during combined equinoxes, whose origin is currently unknown.